What used to treat chloroquine?

Chloroquine is primarily used to prevent and treat malaria, particularly strains caused by Plasmodium vivax and Plasmodium malariae. It is also used to treat autoimmune diseases such as rheumatoid Arthritis and lupus erythematosus. Historically, it was one of the main medications for malaria before the emergence of drug-resistant strains led to the development of alternative treatments.